Manufacturers with Excellent customer service

Bryston is another one.

Roger West at Sound Labs
Ralph Kartsen at Atma-Sphere
Jason at Elusive Disc
Radomir Bozevic at TACT Audio. He tried as hard as he could against overwhelming odds.
Me in my own mind:)

Mike Sanders Quicksilver Audio!

Yeah, Mike Sanders.   Once upon a time, I lived maybe ten minutes away from the guy.  I had Numbers 031 and 032 Mono Amps (or was it Nos. 032 and 033?). It was the time when he was using 8417 output tubes which were, how shall I say it, lovely sounding but a bit cranky.  He was ever patient with me as I'd show up to get replacement pairs.  As for the sound of the amps themselves, sheer bliss.

Someone else mentioned Carl Marchisotto of Nola speakers. I have an interesting story.  One of the midranges on a Nola speaker blew.  I called Nola; much to my surprise, Mr. Marchisotto answered the phone.  Nola did not have a replacement midrange, but he spent a half an hour on the phone with me talking about which speaker manufacturers made a suitable replacement.  Very impressed with him.